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作 者:马俐华[1] 袁鹰[1] 曾强[1] 王曦[1] 齐永芬[2] 唐朝枢[3]
机构地区:[1]中国人民解放军总医院老年心血管二科,北京100853 [2]北京大学第一医院心血管病研究所,北京100034 [3]北京大学医学部生理学与病理生理学系,北京100083
出 处:《中华高血压杂志》2009年第12期1104-1108,共5页Chinese Journal of Hypertension
基 金:国家自然科学基金(No.30570738)
摘 要:目的观察肾上腺髓质素2(ADM2)对血管紧张素Ⅱ(AngⅡ)刺激血管平滑肌细胞(VSMCs)增殖的影响。方法采用培养的大鼠胸主动脉VSMCs,分为5组:对照组(n=6)、ADM2组(10-9~10-6mol/L,n=24)、AngⅡ组(10-7mol/L,n=6)、AngⅡ(10-7mol/L)+ADM2(10-9~10-6mol/L)组(n=24)、ADM2受体拮抗剂(ADM22-52或CGRP8-37)组(n=12)。用胸腺嘧啶核苷(3H-TdR)掺入法检测细胞DNA合成,噻唑兰比色法(MTT)观察VSMCs增殖,并加入受体拮抗剂后观察其促增殖作用。结果不同浓度的ADM2对未经AngⅡ诱导的VSMCs呈剂量依赖性地促增殖作用(P<0.01)。ADM2(10-9~10-6mol/L)抑制AngⅡ引起VSMCs的3H-TdR掺入量的增加,与AngⅡ组比较,AngⅡ+ADM2(10-9~10-6mol/L)组VSMCs的DNA合成抑制率分别为28%、32%、44%和52%(均P<0.01)。MTT结果显示,增殖抑制率分别为9%、14%、16%和20%(均P<0.01)。拮抗剂降钙素基因相关肽8-37(CGRP8-37)和ADM22-52消除了ADM2对AngⅡ增殖细胞作用的抑制。与不加拮抗剂相比,分别增高了34%和43%(P<0.01)。结论ADM2可抑制AngⅡ诱导的VSMCs增殖肥大的作用,从而完成其扩张血管、进而降低血压的作用。Objective To evaluate the modulated role of Adrenomedullin 2 (ADM2) in vascular smooth muscle cell proliferation induced by angiotensin II (Ang II ). Methods Aortic vascular smooth muscle ceils (VSMCs) from cultured rats were used for the present studies. In the absence of serum cells were cultured with placebo ascontrol(n:6), or withADM2(10^-9~10^-6 mol/L, n:24), orAng II(10^- 7 mol/L, n=6), orAng II (10^-7mol/L)+ ADM2(10^-9~10^-6mol/L)(n=24), orAng II(10^-7 mol/L)+ADM2 (10^-9 mol/L)+ ADM22- 52 (10^- 7 mol/L) or CGRPS-37 (10^- 7 mol/L)(n=12). VSMCs proliferation were determined by measuring ^3 H-Thymidine incorporation, cell number, uptake of 3 (4,5 dimethylthiazol-2-yl)-diphenyl-tetrazolium bromide (MTT). Results ADM2 doses dependently stimulated VSMCs proliferation and in the range of(10^-9~10^-6mol/L). On contrary, ADM2 inhibited the increases of 3 H-Thymidine incorporation into VSMCs, and the elevated DNA composition induced by Ang ]I by 28%, 32%, 44% and 52%, all P〈0.01 ; MTT optical density showed the proliferation rate by Ang II was attenuated by 9%, 14%, 16 % and 20%(all P〈0.01). Co-cultured with CGRPS-37 or ADM22-52 offset the inhibition effect by ADM2 (P〈0.01). Conclusion The present study showed that ADM2 significantly inhibit Ang II induced VSMCs proliferation. The clinical significance of the inhibition effect by ADM need further investigated.
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